/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */


import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.mysql.jdbc.Statement;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author Yongke
 */
@WebServlet(name="logout", urlPatterns={"/logout"})
public class logout extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException, ClassNotFoundException, InstantiationException, IllegalAccessException, SQLException {
            PrintWriter out = response.getWriter();
            Connection conn = null;
            Statement stmt = null;
            ResultSet rs = null;
            response.setContentType("text/html;charset=UTF-8");
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost/myrc","progin","progin");
            stmt = (Statement) conn.createStatement();
            PreparedStatement ps = null;
            HttpSession session = request.getSession();
            String X = (String) session.getAttribute("username");

            try {
                ps = (PreparedStatement) conn.prepareStatement("update user set Online = 0 where Username = ?");
                ps.setString(1, X);
                ps.executeUpdate();
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Logging out</title>");
            out.println("<meta HTTP-EQUIV='REFRESH' content='1; url=index.jsp'>");
            out.println("<link rel='StyleSheet' href='redirect.css' />");
            out.println("</head>");
            out.println("<body>");
            out.println("<div id='info'>Logging you out...</div>");
            out.println("</body>");
            out.println("</html>");
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        }
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SQLException ex) {
            Logger.getLogger(logout.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
